JEE Advanced | 2017Gaseous StateHard

Question

Which of the following combination will produce H₂ gas?

Options

A.

Fe metal and conc. HNO3

B.

Cu metal and conc. HNO₃

C.

Zn metal and NaOH(aq)

D.

Au metal and NaCN (aq) in the presence of air

Solution

$Zn Â + Â 2 NaOH â†’ Na Â {ZnO}_{2} Â + Â H_{2}$

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